Excess alcohol ultimately clogs alimentary canal (4)
I believe the answer is:
glut
'excess' is the definition.
(glut can mean an excess of something)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for glut that I've seen before include "Excess, surfeit" , "An excessive supply, maybe on the market" , "Satiate" , "An excessive supply, just too much" , "An over-supply, harvest surplus" .)